Given the IRF6156 Bi-Directional N-channel Switch found here:
I guess it's just easy to make.
Applications seem to be limited to switching the negative terminals of various sources. This would play hell with any smart battery communications.
Even isolated parts would be more useful.
RL
Maybe they're just calling the outer terminals the sources since they are at an externally controlled voltage. The voltage of the inner terminals, in the off state, would be determined by the chance balance of leakage currents between the two devices.
-- john
The outside terminals are the sources and as Legg points out this MOSFET must be driven by a special driver and not suibule for most Bi-directional uses. The inner drains never float but are constrained by the parasitic diodes and are one diode drop less voltage than the most positive source. Harry
Yes, I was forgetting the diodes. But they're not parasitic, they're intentional ESD diodes. Anyway, it does look as if this thing isn't for general use.
-- john
Tell us where you can obtain MOSFETs without parasitic diodes, we all want to know. Harry
SOI ?:-)
...Jim Thompson
-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et |
"Jim Thompson" wrote in message news: snipped-for-privacy@4ax.com...
Say what, Silicon On Insulator?? Harry
Yep. I've done one GPS receiver on a SOI CMOS process.
SOI is also often used in circuits requiring RAD-HARD.
...Jim Thompson
-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et |
What do you mean by parasitic? There have been mosfets without protection diodes. I blew out a number of them in the 1970's.
-- john
That's it then, you blew them all up and there's none left. You must have worked on RTL and DTL because there are none of those around either. Sorry for the Boki writing style, we went to different schools together. Harry
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